If you are on an extension of stay (based on X reason), and you do not CANCEL that extension before leaving Thailand, what happens?

Example: On an extension of an education visa, simply left Thailand left let it run out. What happens?

“Does anyone know how emergency 7 day visa or overstay affect future entry and visa applications? “

Trying to figure out whats the best for me the end of December 🙏🏽

I wanna fly back in March 2024, and just wondering, if that can be problem that time for me

Thanks

I put a previous post about cancelling my visa and work permit, my work have told me that they can cancel the work permit but there may not be enough time to cancel the visa (Non-B) in time (I fly back to UK on 21st) … as they said the signature for the letter may not be able to be done in time…

Anyway, has anyone got experience of not being able to cancel a long term visa and just leaving with an exit stamp?

And would doing this make future visa applications impossible or is it easy enough to get around if you have evidence (my employer agreeing to the cancellation etc…) has anyone had experience of trying to get a new long term visa after this?

Please let me know asap!